6688643 has 8 divisors (see below), whose sum is σ = 7232736. Its totient is φ = 6148800.

The previous prime is 6688639. The next prime is 6688651. The reversal of 6688643 is 3468866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6688643 - 2² = 6688639 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6688643.

It is not an unprimeable number, because it can be changed into a prime (6688603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2738 + ... + 4568.

It is an arithmetic number, because the mean of its divisors is an integer number (904092).

Almost surely, 2^6688643 is an apocalyptic number.

6688643 is a deficient number, since it is larger than the sum of its proper divisors (544093).

6688643 is a wasteful number, since it uses less digits than its factorization.

6688643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125.

The product of its digits is 165888, while the sum is 41.

The square root of 6688643 is about 2586.2410947164. The cubic root of 6688643 is about 188.4137841649.

The spelling of 6688643 in words is "six million, six hundred eighty-eight thousand, six hundred forty-three".